Mathematics · Compound Interest
एक धनराशि चक्रवर्धि ब्याज की एक निश्चित वार्षिक दर पर 5 वर्षों में दोगुनी हो जाती है। वही धनराशि उसी ब्याज दर पर कितने वर्षों में स्वयं की 4 गुनी हो जाएगी?
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